Knotting-hook for tyers for grain-binders



(No Model.)

w. W. BURSON. KNOTTING HOOK FOR TYERS FOB. GRAIN BINDERS;

No. 490,636. 7 Patented Jan. 31, 1893.

PATENT I? FFECEQ WVILLIAM I/VORTH BURSON, OF CHICAGO, ILLINOIS.

KNOTTlNG-HOOK FOR TYERS FOR GRAIN-BINDERS.

SPECIFICATION forming part of Letters Patent No. 490,636, dated January31, 1893. Application filed December 2. 1884. serial No. 149,345. (Nomodel.)

To all whom it may concern:

Be it known that I, WIL IAM WORTH BUR- SON, a citizen of the UnitedStates, residing at Chicago, in the county of Cook and State ofIllinois, have invented certain new and useful Improvements in Knottersfor Grain-Binders, of which the following is a specification.

This invention is applicable to knotting books of the tying-bill type:that is of the type originated by Behel and afterward adopted anddeveloped in the well known Locke and Appleby binders, consisting of ahead or jaw rigidly connected with a spindle and another jaw hinged tosaid head,the two jaws together having an outline resembling that ofabirds head and bill, whence has come the designation of that type.I-Ieretofore such bills have usually been constructed, so far as I amaware, by casting the fixed jaw integral with the spindle and thenturning down the spindle, filing off and polishing the jaw, filing theseat or mortise for the pivoted jaw, drilling holes through both jawsand, finally, uniting them by a pivot-pin passing through both andriveted or clinched by hammering. Such tying bills are practicallylimited to malleable iron as the metal to be made from, because thatonly is sufficiently soft to permit of the hole for the pivot beingdrilled and of the shaft or spindle being properly turned down. Ipropose to employ a spindle made of turned or cold rolled iron or steel,and a head and fixed jaw of any suitable cast-metal, not necessarilymalleable cast iron, united to said spindle in a practically integralmanner, while the pivoted jaw is united to said fixed jaw either by earsor bearings formed in the process of casting, so as to omit altogetherthe independent pivot-pin and obviate the necessity of drilling andriveting.

In the drawings Figure 1 is a side view of a tying-bill (such asdescribed in an applicartion filed by me in the Patent Office of thed'lnited States on or about the 18th day of August, 1884:, Serial No.140,913,) but con strueted according to my present invention, ,thedotted lines showing the form of a core and of a .chill employed in itsmanufacture. Fig. 2 is a face view of the same with the pivoted jawremoved: Fig. 3 represents the hinged jaw detached and Fig. 4 amodification of said jaw: Fig. 5 represents a core used in casting themortise in the fixed jaw, the hinged jaw being incorporated in andforming part of said core: and Fig. 6 represents the well known Applebyknotter to which my improvement may be applied, as above stated.

The invention will be better understood by comparing the process ofmanufacture of the Appleby and similar knotters, with the processemployed by me, and explaining the structural changes which are, or maybe brought about by the use of my process. To the latter, however I makeno claim herein.

The usual way of making knotters of the modern tying-bill type, is toplace a core in the mold, by which an opening or mortise passing throughthe neck from front to rear is made in the fixed jaw, to receive thepivoted jaw. The jaw with its spindle is then cast from malleable metaland when removed from the mold is rough, both externally and along thesides of the mortise, which latter must be considerably larger thanwould otherwise be necessary, or must, like the exterior surface of thejaw, be smoothed off with a file, untilaproper shape and fit areobtained. The spindle must then be turned for its bearing and finally arivet-hole must be drilled through the fixed jaw at right angles to themortise and countersunk on both sides, and a hole drilled in the hingedjaw which is then placed in position, a 'rivet inserted through both toform the pivot and hammered down until upset audproperly secured. Inpractice a poor fit is bad sidewise for the hingedaw.

Sometimes instead of casting the spindle homogeneous with the fixed jawand afterward turning it,a socket is drilled in the face of the fixedjaw and shaft inserted and pinned or fastened therein, which,however,does not make a strong or durable union of the two.

In the knotters depicted in the drawings, A is the fixed jaw, B thepivoted jaw, C the tyer-spindle, and D the pivot for the hinged aw.

In the construction of my knotter the head and fixed jaw are made of anysuitable cast metal. The spindle, however, is preferably of turned orcold rolled iron or steel, the upper end where it is united withthefixed jaw being flattened, drilled or roughened and being securedthereto in the operation of casting which is generally done by insertingthis flattened drilled or roughened end a suitable distance into themold and in its proper relation to the jaw when the latter shall havebeen cast therein. So far, however, as relates to other features of myinvention, the fixed jaw and the spindle may be cast as one integralbody. The hinged jaw is preferably made smooth, and of the desired shapeat the outset, having at the pivotal point, a hole, E, of a proper sizeand countersunk on both sides. It is not, however, indispensablynecessary that this hole should extend through this jaw as a countersinkon both sides will serve the purpose. This jaw is then placed in, andbecomes part of the core, F, which is to form the opening or mortise inthe fixed jaw in which said hinged jaw is pivoted and has its movement.The core is not intended to entirely cover the hinged jaw, but only toinclose its edges, leaving its sides exposed and flush with the sides ofsaid core. The part of the hinged jaw which is to come in contact withthe metal of the fixed jaw when at work, is then blackwashed or thinlycoated with any of the substances well known to foundrymen whereby itshall be prevented from adhering to the molten metal poured into themold to form the fixed jaw and in the complete knotter will have properclearance and play while being held accurately in position by thesurrounding cast metal and integral pivots or bearings of the fixed jaw.

To insure a smooth, square and exceedingly durable surface upon thefixed jaw where it unites with the spindle, a metal collar or chill, G,is set upon said spindle when the latter is placed in the mold forcasting, its effect being to produce a chilled wearing surface at thejuncture of the spindle with the fixed jaw. This collar is readilyremoved when the casting is cool, and can be used continuously.

The spindle and the core containing the hinged jaw being placed inproper position, it will be understood that the molten metal is thenpoured into the mold to form the fixed jaw which is thus made fast tothe spindle and secured to the hinged jaw, the fluid metal enteringintothe pivotal bearing formed in the latter or into the countersinks, andprevented from adhering by the blackwash, being chilled or case-hardenedby the action of the cold metal of the hinged jaw. The bill is thenremoved from the mold with all parts united and ready for action, theonly finishing required, if any, being the polishing of the surface ofthe fixed jaw.

Instead of a hole through the pivoted jaw to receive the fluid metal ofthe fixed jaw in the process of casting, for the purpose of replacingthe rivet usually employed as a pivot, pintles or trunnions may beformed on the sides of the jaw as at E in Fig. 4, which will serve aspivots on which the jaw will vibrate, the bearings for said pintlesbeing then formed in the fixed jaw when the latter is cast and beingchilled or case-hardened in the act of casting round the cold metal ofthe pintles so as to give better wearing qualities.

It will be readily seen that the hinged jaw of the Appleby knotter asshown in Fig. 5 and the clasp of my knotter hook patented March 13,1883, No. 273,811, may be constructed and secured in their positionsaccording to this method. It will also be understood that the tying-billthus produced is cheaper, more aocuratelyfitted and more durable thanthose otherwise constructed, not being in any manner weakened bydrilling or striking of the hammer in riveting and having its wearingsurfaces partially chilled or case-hardened which it is not feasible todo by the ordinary method of constructing.

I claim:

' 1. In a knotter for grain-binders, the combination with the cast metalhead and fixed jaw, having a slotted opening or mortise and pivotalbearin gs in said mortise integral with the head, of the movable jawplaying in said mortise and hinged upon said bearings, substantially asdescribed.

2. In a knotter for grain-binders, the combination of a wrought metalspindle, a cast metal head and fixed jaw having a slotted opening ormortise, and a movable jaw playing in the opening and pivoted upon ahearing integral with the head and fixed jaw, and co-operating with saidfixedjaw, substantially as described.

3. In a knotter for grain-binders, the combination of a wrought metalspindle, a cast metal head and fixed jaw having a chilled seat orbearing surface at its juncture with the spindle and a slotted openingor mortise through its body with chilled bearings in said openingintegral with the body, and a movable jaw playing in the opening andhinged upon said bearingsjsubstan tial] y as described.

WILLIAM WOIt'lll BURSON. [as] I'Vitnesses:

S. G. BRoNsON, II. D. EASTMAN.

